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Did anyone get a problem with the M12 set where the charger is throwing out a faulty battery pack error? Happened to both batteries and the same thing happened when I went back to the store to swap units.

I have limited experience with different brands. I had Dewalt for a while and switched to Porter cable. The general consensus is that the Ni-cad batts last appx 5 years and you get about 2.5 years from the lithium ion. IMO the smaller size and faster charging time is worth it on the lithium ions.

Did anyone get a problem with the M12 set where the charger is throwing out a faulty battery pack error? Happened to both batteries and the same thing happened when I went back to the store to swap units.

I have the M12 series of tools. The sawzall and driver drill. Went to use the sawzall the other day and battery was dead. Plugged in the charger and put the batterie in and got the faulty battery lights flashing. Never used that batterie before. Brand new. I should take it back to see if I could get a new batterie.

I have alot of Dewalt and everyone in our company save one guy has Dewalt. Better power and ergonomics. As far as the claim of batteries not lasting...... I guess someone forgot to tell mine as I have some batteries still going after 12 yrs of use. They are not as strong as when they were new..... but I have only had a few fully fail and they got replaced. As I have multiple drills, recip saw, circular saw, lamps, sheetmetal shears, cut-off tool, spiral saw, multiple chargers..... etc etc I will not be switching anytime soon. I must admit that the last non-Dewalt I used for more then an instant was yrs ago so the only comparison I can give is on the breakdowns and failures I see going through our warehouse. One thing I really like about Dewalt is that everything they make can take either lithium-ion or regular nickel-cadium batteries. They are universal to all 18 volt tools.

Warning: Just because I am over the head injury doesn't mean I'm normal!

ive tried Hitachi and did not really care or them. ive moved onto craftsman and have not had any trouble

Which model? My kids bought me a 14.4V Diehard a few years ago and while it is OK for occassional use I have found that the batteries loose the charge after sitting for a few days.
Also they don't hold it for very long and after drilling a few holes with a hole saw they start to loose their oomph.

If you can't fix it with JB Weld, Duct Tape, and Ty Wire it has to be replaced.
No good deed goes unpunished.
If you want to take off friday to go fishing then make sure you train your helper right.